How to install metal roofing over old shingles with different way
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There are really two ways to install a metal roof over a shingle roof. These slats of wood run perpendicular to the metal roofing itself. Purlins can be used to provide space between the old roofing and the new metal roofing panels.
To vent the roof, holes are cut in the old roof (detail 1) above the soffit, which pulls air through the soffit vents underneath.
However, before you decide on reroofing with a metal roof, you have to keep in mind that there are specific conditions that make reroofing with a metal roof safe. This is more expensive but will also be higher quality. The most often used and popular method, if there are no problems with the wood underneath your existing shingles, is to place underlayment on top of the shingles, then screw the metal over top. A benefit to doing it this way is that you can see if there is any rotten plywood that needs to be replaced before installing the new roof.
